EP0755914B1 - Verfahren zur Herstellung von Isobenzofurandionen - Google Patents
Verfahren zur Herstellung von Isobenzofurandionen Download PDFInfo
- Publication number
- EP0755914B1 EP0755914B1 EP96111158A EP96111158A EP0755914B1 EP 0755914 B1 EP0755914 B1 EP 0755914B1 EP 96111158 A EP96111158 A EP 96111158A EP 96111158 A EP96111158 A EP 96111158A EP 0755914 B1 EP0755914 B1 EP 0755914B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- maleic
- phase
- fumaric acid
- palladium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
- C07C51/377—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups
Definitions
- the present invention relates to an improved method for producing Isobenzofuran ions by dehydrogenation of tetrahydroisobenzofuran ions in Presence of supported palladium and / or platinum catalysts.
- the process has the disadvantage that diethyl maleate must be used in excess (240 mol%) and out the excess at the reaction temperatures form fumarates. Disrupt fumarates due to their sublimation behavior during the processing and must by the Hydrogen uptake resulting diethyl succinate are separated.
- the object of the present invention was therefore to provide a method that overcomes the disadvantages of the prior art and allows it to be technical isobenzofurandione by catalytic dehydrogenation in to produce high yields.
- catalysts are Palladium and / or platinum supported catalysts known per se into question, for example those that 0.1 to 10 wt .-% Palladium and / or platinum on aluminum oxide, silicon dioxide, silica, diatomaceous earth, Contain silicates or coal.
- the catalysts preferably contain 1 to 8% by weight of palladium and / or platinum on aluminum oxide or activated carbon. Especially supported palladium catalysts are preferred.
- the palladium and / or platinum can not only in metallic form but also can be used in the form of connections. Generally such Compounds reduced to metal under the reaction conditions.
- the catalyst is preferably used in the most anhydrous form possible.
- Palladium supported catalysts are often only commercially available in water-containing form available.
- Such water-containing catalysts can be freed from water, by first mixing them with a water-miscible solvent, e.g. a low alcohol, washes and then with a system inherent Treated product, e.g. a succinic acid derivative such as dimethyl succinate. If Water is present in the reaction system, this leads to the cleavage of the anhydride group in the tetrahydroisobenzofurandione used and / or in the formed Isobenzofurandione and thus to undesirable by-product formation.
- a water-miscible solvent e.g. a low alcohol
- a system inherent Treated product e.g. a succinic acid derivative such as dimethyl succinate.
- the catalyst can be carried out when carrying out the process according to the invention in a swamp mode, for example in amounts of 1 to 10% by weight Use palladium and / or platinum, based on the starting material. Preferably is this amount 2 to 8 wt .-%.
- a trickle phase procedure you can e.g. about conduct one liter of supported catalyst 50 to 300 ml feed mixture per hour.
- maleic and fumaric acid derivatives are Maleic anhydride, Maleinimide, Maleinamid Vietnamese hand, Maleinklarealkylester and Fumarkierealkylester in Question.
- Maleic anhydride, dimethyl maleate and diethyl maleate are preferred and fumaric acid dimethyl and diethyl esters, very particularly preferred are dimethyl maleate and dimethyl fumarate.
- the respective maleic or fumaric acid derivative can, for example, in an amount from 180 to 220 mol%, based on the starting material, are used. Preferably this amount is 190 to 210 mol%, in particular 195 to 205 mol%.
- the inventive method is at temperatures from 120 to 300 ° C. carried out. It is preferable to work at 130 to 250 ° C. With the swamp way of driving is in the first heating phase from room temperature up to 80 to 110 ° C the rate of increase of the temperature without special meaning. From 80 to 110 ° C, the temperature is left at a rate of 0.6 to 3 ° C per minute, preferably rise 0.8 to 2.0 ° C per minute. At temperature rise rates The achievable yield drops below 0.6 ° C per minute (see comparative example 1). Temperature rise rates of more than 3 ° C per minute would be technical Scale require an uneconomically high expenditure on equipment.
- the pressure during the reaction is not critical and can e.g. at 1 to 10 bar, preferably at normal pressure up to 3 bar.
- the reaction is generally finished after 1 to 4 hours.
- the catalyst loads indicated above are such that a practically complete Turnover is achieved in one pass.
- the mixture present after the reaction has ended can be worked up, for example, as follows: first, any catalyst present is separated off and then the succinic acid derivative formed from the maleic or fumaric acid derivative is removed, for example by distillation under reduced pressure.
- the isobenzofuran dione formed which corresponds, for example, to the formula (II) in which R has the meaning given for formula (I), is often left in such a pure form that it can be used directly. If necessary, it can be cleaned further, for example by distillation.
- the process according to the invention has a number of surprising advantages. So was to be assumed that at the high reaction temperatures maleic and Fumaric acid derivatives with the anhydride group of tetrahydroisobenzofurandione react. This possibility of reaction is in the process according to C.A. 108: 37393e excluded, since only esters are used there and not how according to the invention, at least one anhydride.
- the succinic acid derivatives formed as co-products are valuable chemical ones
- Intermediates which are biodegradable compounds for can be used for a variety of purposes, e.g. as a solvent, as components for the production of polyesters and as intermediates for organic Pigments.
- dimethyl succinate with a Boiling point distilled from 96 to 98 ° C (purity over 99.3 wt .-%).
- Distillation residue had a content of 5-methyl-isobenzofurandione-1,3 from over 96% by weight. The yield was 97% of theory.
- the 5-methylisobenzofurandione-1,3 was distilled and with a boiling point of 177 ° C. 30 mbar obtained in a very pure form.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
- Furan Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- R
- für Wasserstoff oder C1-C6-Alkyl steht. Vorzugsweise steht R für Methyl.
Claims (9)
- Verfahren zur Herstellung von Isobenzofurandionen durch Dehydrierung von Tetrahydroisobenzofurandionen in Gegenwart von Katalysatoren bei erhöhter Temperatur, dadurch gekennzeichnet, daß man destillierte Tetrahydroisobenzofurandione in Gegenwart von Palladium- und/oder Platin-Trägerkatalysatoren und in Gegenwart von Malein- und Fumarsäurederivaten in einem Rieselphasen- oder Sumpfphasenverfahren auf Temperaturen zwischen 120 und 300°C erhitzt, wobei man beim Sumpfphasenverfahren oberhalb 80 bis 110°C die Temperatur mit einer Rate von 0,6 bis 3°C pro Minute ansteigen läßt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man Tetrahydroisobenzofurandione der Formel (I) einsetzt in der
- R
- für Wasserstoff oder C1-C6-Alkyl steht,
- Verfahren nach Ansprüchen 1 und 2, dadurch gekennzeichnet, daß man als Katalysatoren solche einsetzt, die 0,1 bis 10 Gew.-% Palladium und/oder Platin auf Aluminiumoxid, Siliziumdioxid, Kieselsäure, Kieselgur, Silikaten oder Kohle enthalten.
- Verfahren nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß man es als Sumpfphasenverfahren durchführt und 1 bis 10 Gew.-% Palladium und/oder Platin, bezogen auf das Edukt, einsetzt.
- Verfahren nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß man es als Rieselphasenverfahren durchführt und über 1 l Trägerkatalysator 50 bis 300 ml Einsatzgemisch pro Stunde leitet.
- Verfahren nach Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß man das Malein- oder Fumarsäurederivat in einer Menge von 180 bis 220 mol%, bezogen auf das Edukt, einsetzt.
- Verfahren nach Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß man beim Sumpfphasenverfahren oberhalb 80 bis 110°C die Temperatur mit einer Rate von 0,8 bis 2,0°C pro Minute ansteigen läßt.
- Verfahren nach Ansprüchen 1 bis 7, dadurch gekennzeichnet, daß man es bei Drucken im Bereich 1 bis 10 bar durchführt.
- Verfahren nach Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß man das nach der Reaktion vorliegende Gemisch aufarbeitet, indem man zunächst gegebenenfalls vorhandenen Katalysator abtrennt und dann das aus dem Malein- oder Fumarsäurederivat entstandene Bernsteinsäurederivat durch Destillation bei vermindertem Druck abdestilliert.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19526923 | 1995-07-24 | ||
DE19526923A DE19526923A1 (de) | 1995-07-24 | 1995-07-24 | Verfahren zur Herstellung von Isobenzofurandionen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0755914A1 EP0755914A1 (de) | 1997-01-29 |
EP0755914B1 true EP0755914B1 (de) | 1999-10-06 |
Family
ID=7767604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96111158A Expired - Lifetime EP0755914B1 (de) | 1995-07-24 | 1996-07-11 | Verfahren zur Herstellung von Isobenzofurandionen |
Country Status (6)
Country | Link |
---|---|
US (1) | US5672719A (de) |
EP (1) | EP0755914B1 (de) |
JP (1) | JPH0931070A (de) |
AT (1) | ATE185338T1 (de) |
DE (2) | DE19526923A1 (de) |
ES (1) | ES2138276T3 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115138363A (zh) * | 2021-03-30 | 2022-10-04 | 中国科学院大连化学物理研究所 | 用于催化脱氢制备苯并呋喃-2(3h)-酮的催化剂及其制备方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3583253D1 (de) * | 1984-02-10 | 1991-07-25 | American Cyanamid Co | Regio und optische isomere von imidazolinyl-toluolsaeure, deren ester und salze, verfahren zu deren herstellung und deren anwendung als herbizide. |
JPH062711B2 (ja) * | 1985-12-24 | 1994-01-12 | 川崎化成工業株式会社 | 置換フタル酸化合物の製造法 |
-
1995
- 1995-07-24 DE DE19526923A patent/DE19526923A1/de not_active Withdrawn
- 1995-09-13 US US08/528,388 patent/US5672719A/en not_active Expired - Fee Related
-
1996
- 1996-07-11 EP EP96111158A patent/EP0755914B1/de not_active Expired - Lifetime
- 1996-07-11 AT AT96111158T patent/ATE185338T1/de not_active IP Right Cessation
- 1996-07-11 DE DE59603269T patent/DE59603269D1/de not_active Expired - Fee Related
- 1996-07-11 ES ES96111158T patent/ES2138276T3/es not_active Expired - Lifetime
- 1996-07-22 JP JP8209369A patent/JPH0931070A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE19526923A1 (de) | 1997-01-30 |
DE59603269D1 (de) | 1999-11-11 |
ES2138276T3 (es) | 2000-01-01 |
ATE185338T1 (de) | 1999-10-15 |
US5672719A (en) | 1997-09-30 |
EP0755914A1 (de) | 1997-01-29 |
JPH0931070A (ja) | 1997-02-04 |
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